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I'm not exactly tiny, I'm not exactly a feather, but lately I've been pondering how, as a younger gal, I can twist aikido to my needs. I'm blessed with a dojo full of friendly, burly guys to practice on! A few thoughts from my headspace atm:

Common obstacles from opponents:
Strength
Weight
Length

My answer:
To combat strength, craft larger spirals. A tighter embrace, a broader swoop.
To combat weight, move deeper. Blend and crest together to utilise the force of gravity and momentum.
To combat length, pivot. Stretch. Hips make a great pulley. Their comfort zone lies much higher than yours, lower your center and your playing zone to maximise control.

Does this sound on the right track? Maybe I'll see something entirely different about it all in the next season.

When it's half a foot or more difference (my own wild estimate, there's probably a measurable ratio somewhere) it appears to have a glaringly obvious effect.
I weigh about 2.5 to 3x what she does, yet she has no problem moving me, due to her centre being much lower (e.g. a hip check destabilises my leg). Stiffening my arm merely gives her a nice lever with which to move me. If I resist otherwise, she changes direction, using my resistance to move me into the technique.

I know what you mean! I had the pleasure of watching at a gassuku about a week ago. The smallest person threw a mammoth enough to clear several meters! It was like the principles needed to be greatly emphasised.
Is lack of height an advantage then? A further thought, could we view relative height as a weakness, an ad for ways by which uke can be overcome? Like other concepts this seems so counter-intuitive yet plausible at the same time, quite opposite to popular culture and common practice.

One of my instructors, at 4'10 to my 6', is naturally low enough to put me off balance almost immediately when I grab her wrist. The initial movement for things like kotegaeshi, kokyu nage, kaiten nage etc is nearly enough to topple me as she moves. My choice is either bend at the waist or squat, if she takes things lower, and both end with me flat on the floor.